Television security system

Details Television security system Television security system

1976-06-18

1978-02-14

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358121, H04N 144

Patent

active

040743110

ABSTRACT:
A system for subscription TV security which is comprised of a scramble signal generator which adds a modulated RF carrier signal to the TV channel transmission. Preferably the frequency of the scramble signal generator is selected to fall within the band of frequencies of the TV channel between the video carrier and the audio carrier. The TV channel is transmitted to receivers encoded with the scramble signal carrier providing false and misleading information, preventing the receiver from reconstituting a coherent picture or sound while this scramble signal is present. The transmitted signal is decoded, (i.e. scramble signal removed), restoring regular reception by filtering with a sharply tuned high-Q notch filter attached to the drop line going to a TV receiver. By careful selection of the band width and attenuation of the filter and pre-emphasis of the channel band, degradation of the video information is prevented.

REFERENCES:
patent: 2905747 (1959-09-01), Kidd et al.
patent: 3202758 (1965-08-01), Brownstein
patent: 3347982 (1967-10-01), Bass et al.
patent: 3760097 (1973-09-01), Burroughs et al.
patent: 3896262 (1975-07-01), Hudspeth et al.

Affiliated with

Also associated with

Rating

Television security system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television security system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television security system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-528492